Needs some help with what to ask for. Some petrol resistant gasket material?

For my filler cap.

Suggestion what to ask for or what to look for on EBay. Links would be great.

Diameter is 45mm but looking for a sheet that I can cut what I need from.

Thanks in advance.

Perfect and I had been through most of their products.

Bought. Should be able to get a few out of the sheet. Even better.